the hassle would be more than worth the time. if nothing else, figure that these things run mid 12's in a 3700 pound car. put that into a 3,000 pound car, and you're looking at 11's in an everyday car. and 30mpg.
also....on the 9" rear? fergetaboutit. go 8.8. it'll handle about 80% of everything a 9" will, and weighs a lot less. parts are more plentiful too.
Not sure about that, as far as parts go. They are about the same. The 8.8" can be used, but needs axle tube stiffeners as well as a different rear cover to include bolts to prevent the rear bearing caps from walking around. Also need to get rid of the c-clip retainers at the same time. Replace the clutch type locker with a Detroit Trutrac. Replace the stock axles with a set of 31 spline units.
Once all that is done, it would hold up as well as the nine inch.
We had had several guys in the Cobra club switch to the Coyote and it has been ripping the 8.8 rear ends apart. Shearing axles, burning out the clutch packs and it will not launch straight without the axle tube stiffeners and bolt cap lock downs.
I am going 8.8 in my Cobra, but it is being sent off to Moser for a complete rebuild first.
Dropping a Coyote into a Cobra is not for the faint of heart. It takes a lot of work to get that engine into the bay so the hood will close.